From: Wei Liu <wei.liu2@citrix.com>
To: xen-devel@lists.xen.org
Cc: Wei Liu <wei.liu2@citrix.com>,
keir@xen.org, ian.campbell@citrix.com, jbeulich@suse.com,
david.vrabel@citrix.com
Subject: [RFC PATCH V4 11/18] Bump EVTCHNS_PER_BUCKET to 512
Date: Tue, 5 Mar 2013 12:30:33 +0000 [thread overview]
Message-ID: <1362486640-14707-12-git-send-email-wei.liu2@citrix.com> (raw)
In-Reply-To: <1362486640-14707-1-git-send-email-wei.liu2@citrix.com>
For 64 bit build and 3-level event channel and the original value of
EVTCHNS_PER_BUCKET (128), the space needed to accommodate d->evtchn would be 4
pages (PAGE_SIZE = 4096). Given that not every domain needs 3-level event
channel, this leads to waste of memory. Having EVTCHN_PER_BUCKETS to be 512
can occupy exact one page.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
xen/include/xen/event.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 919f0e2..e2c3736 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -39,7 +39,7 @@ static inline unsigned int max_evtchns(struct domain *d)
return ret;
}
-#define EVTCHNS_PER_BUCKET 128
+#define EVTCHNS_PER_BUCKET 512
#define NR_EVTCHN_BUCKETS (NR_EVENT_CHANNELS / EVTCHNS_PER_BUCKET)
struct evtchn
--
1.7.10.4
next prev parent reply other threads:[~2013-03-05 12:30 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-05 12:30 [RFC PATCH V4] Implement 3-level event channel ABI in Xen Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 01/18] xen: correct BITS_PER_EVTCHN_WORD on arm Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 02/18] Clean up trailing whitespaces Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 03/18] Dynamically allocate d->evtchn Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 04/18] Move event channel macros / struct definition to proper place Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 05/18] Add d->max_evtchns Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 06/18] Add evtchn_is_{pending, masked} and evtchn_clear_pending Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 07/18] Implement extended event channel ABIs query Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 08/18] Define 3-level event channel registration interface Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 09/18] Add evtchn_extended in struct domain Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 10/18] Calculate max event channels for EVTCHN_EXTENDED_L3 Wei Liu
2013-03-05 12:30 ` Wei Liu [this message]
2013-03-15 18:15 ` [RFC PATCH V4 11/18] Bump EVTCHNS_PER_BUCKET to 512 David Vrabel
2013-03-15 18:37 ` Wei Liu
2013-03-15 18:43 ` David Vrabel
2013-03-05 12:30 ` [RFC PATCH V4 12/18] Update Xen public header xen.h Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 13/18] Genneralized event channel operations Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 14/18] Introduce EVTCHN_WORD_BITORDER macro Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 15/18] Infrastructure to manipulate 3-level event channel pages Wei Liu
2013-03-05 14:22 ` Jan Beulich
2013-03-05 12:30 ` [RFC PATCH V4 16/18] Implement 3-level event channel routines Wei Liu
2013-03-05 14:28 ` Jan Beulich
2013-03-05 16:07 ` Wei Liu
2013-03-05 16:13 ` Jan Beulich
2013-03-05 12:30 ` [RFC PATCH V4 17/18] Only allow extended event channel on Dom0 and driver domains Wei Liu
2013-03-05 12:30 ` [RFC PATCH V4 18/18] libxl: add evtchn_extended_allowed flag Wei Liu
2013-03-05 13:48 ` Ian Jackson
2013-03-05 17:11 ` Wei Liu
2013-03-05 17:38 ` Ian Jackson
2013-03-05 17:51 ` Wei Liu
2013-03-05 17:56 ` David Vrabel
2013-03-05 18:08 ` Wei Liu
2013-03-06 17:16 ` Wei Liu
2013-03-07 11:23 ` David Vrabel
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